Multi-scale digitizer using 3d magnetic force sensor and magnetic force pen

Abstract

Provided is a multi-scale digitizer using a 3D magnetic force sensor and a magnetic force pen, wherein one or more magnetic force sensors are installed inside a recognition device, and a change in a magnetic field of an external input unit with a magnetic material installed therein is measured through the sensors to detect a position of the external input unit. Since the digitizer capable of detecting position information of an external input unit by using the magnetic force sensors installed inside the recognition device is implemented, there is no need to provide a separate digitizer panel, and thus, a display device may be reduced in weight and thickness.

1 . A multi-scale digitizer using a 3D magnetic force sensor and a magnetic force pen, comprising a recognition device and an external input device, wherein one or more magnetic force sensors installed in the recognition device include: a magnetic field sensor module mounted on an inner surface of an enclosure of the recognition device, configured to measure a magnetic force vector and a magnetic force variation in a three-dimensional (3D) direction emitted from the external input unit and amplify a measured signal; a sensor communication module installed inside the enclosure of the recognition device and configured to adjust the signal of the magnetic force vector and the magnetic force variation measured by the magnetic sensor module; and a recognition device auxiliary control module configured to receive a measurement value of the magnetic force vector and the magnetic force variation output from the sensor communication module and including a position detection algorithm for calculating spatial coordinates of the external input unit by comparing the received measurement value with a magnetic force vector spatial distribution data stored in the recognition device, wherein the recognition device visually displays spatial coordinates of the external input unit on a display by executing a multi-magnification coordinates recognition program for user recognition, and stores the spatial coordinates of the external input unit as an image or an electronic file. 
     
     
         2 . The multi-scale digitizer of  claim 1 , wherein the magnetic force sensor is installed to be stacked inside the enclosure having a polygonal shape in which an upper surface and a lower surface parallel to each other are present. 
     
     
         3 . The multi-scale digitizer of  claim 1 , wherein the external input unit includes a cylindrical body; a magnetic material kept inside the body and generating a magnetic field sensed by the recognition device; and an ink tip attached to an end portion of the body and having ink in an internal passage thereof. 
     
     
         4 . The multi-scale digitizer of  claim 3 , wherein the magnetic material is formed of any one among a neodymium (Nd) alloy, an iron (Fe) alloy, a samarium (Sm) alloy, a cobalt (Co) alloy, a platinum (Pt) alloy, a manganese (Mn) alloy, a bismuth (Bi) alloy, a barium (Ba) alloy, and a nickel (Ni) alloy, and is formed to have any one among a cylindrical shape, a conic shape, a truncated conic shape, a tube shape, a spherical shape, a hemispherical shape, and a square shape. 
     
     
         5 . The multi-scale digitizer of  claim 3 , wherein the ink tip is formed of any one of materials among graphite, iron sulfate (FeSO 4 ), a tannic acid (C 14 H 11 O 9 ), a gallic acid (C 7 H 6 O 5 ), phenol (C 6 H 5 OH), rubber, aniline blue, auramine, eosin, titanium dioxide, iron sesquioxide, and synthetic tar dye. 
     
     
         6 . The multi-scale digitizer of  claim 1 , wherein the sensor communication module discriminately recognizes analog signal information of voltages and currents received from the magnetic field sensor module according to each magnetic field sensor module and accumulates the input currents and voltages, and when the accumulated currents and voltages are equal to or greater than a preset value, the sensor communication module converts the signals through a method of outputting digital information. 
     
     
         7 . The multi-scale digitizer of  claim 1 , wherein the recognition device uses any one of a 3D coordinates conversion method of measuring a position of the external input unit by comparing a spatial distribution of magnetic force vectors and magnetic force variations appearing due to a difference between relative positions of the external input unit and the magnetic field sensor module and magnetic force vectors and magnetic force variations sensed by one or more magnetic field sensor modules, and a triangulation method of detecting a position of the external input unit by triangularly measuring magnetic force vectors and magnetic force variation values received from a plurality of magnetic sensor modules.